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<p>Dart&#x4F7F;&#x7528;<code>import</code>&#x8BED;&#x53E5;&#x7528;&#x6765;&#x5BFC;&#x5165;&#x4E00;&#x4E2A;&#x5E93;&#xFF0C;&#x540E;&#x9762;&#x8DDF;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x5F62;&#x5F0F;&#x7684;Uri&#x6765;&#x6307;&#x5B9A;&#x8868;&#x793A;&#x8981;&#x5F15;&#x7528;&#x7684;&#x5E93;&#x3002;</p>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x6307;&#x5B9A;dart:&#x524D;&#x7F00;&#xFF0C;&#x8868;&#x793A;&#x5BFC;&#x5165;&#x6807;&#x51C6;&#x5E93;&#xFF0C;&#x5982;dart:io</span>
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;dart:math&apos;</span>;

<span class="hljs-comment">// &#x4E5F;&#x53EF;&#x4EE5;&#x7528;&#x76F8;&#x5BF9;&#x8DEF;&#x5F84;&#x6216;&#x7EDD;&#x5BF9;&#x8DEF;&#x5F84;&#x6765;&#x5F15;&#x7528;dart&#x6587;&#x4EF6;</span>
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;lib/student/student.dart&apos;</span>;

<span class="hljs-comment">// &#x6307;&#x5B9A;package:&#x524D;&#x7F00;&#xFF0C;&#x8868;&#x793A;&#x5BFC;&#x5165;&#x5305;&#x7BA1;&#x7406;&#x7CFB;&#x7EDF;&#x4E2D;&#x7684;&#x5E93;</span>
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;package:utils/utils.dart&apos;</span>;
</code></pre>
<p>&#x5BFC;&#x5165;&#x5E93;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>as</code>&#x5173;&#x952E;&#x5B57;&#x6765;&#x7ED9;&#x5E93;&#x8D77;&#x522B;&#x540D;&#xFF0C;&#x907F;&#x514D;&#x547D;&#x540D;&#x7A7A;&#x95F4;&#x51B2;&#x7A81;&#x3002;</p>
<pre><code class="lang-dart"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;package:lib1/lib1.dart&apos;</span>;
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;package:lib2/lib2.dart&apos;</span> <span class="hljs-keyword">as</span> lib2;

<span class="hljs-comment">// &#x4F7F;&#x7528;lib1&#x4E2D;&#x7684;Element</span>
<span class="hljs-built_in">Element</span> element1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Element</span>();
<span class="hljs-comment">// &#x4F7F;&#x7528;lib2&#x4E2D;&#x7684;Element</span>
lib2.<span class="hljs-built_in">Element</span> element2 = <span class="hljs-keyword">new</span> lib2.<span class="hljs-built_in">Element</span>();
</code></pre>
<p>&#x4F7F;&#x7528;<code>show</code>&#x548C;<code>hide</code>&#x5173;&#x952E;&#x5B57;&#x63A7;&#x5236;&#x5E93;&#x4E2D;&#x6210;&#x5458;&#x7684;&#x53EF;&#x89C1;&#x6027;</p>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x4EC5;&#x5BFC;&#x5165;foo&#xFF0C;&#x5C4F;&#x853D;&#x5E93;&#x4E2D;&#x5176;&#x4ED6;&#x6210;&#x5458;</span>
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;package:lib1/lib1.dart&apos;</span> show foo;

<span class="hljs-comment">// &#x5C4F;&#x853D;foo&#xFF0C;&#x5E93;&#x4E2D;&#x5176;&#x4ED6;&#x6210;&#x5458;&#x90FD;&#x53EF;&#x89C1;</span>
<span class="hljs-keyword">import</span> <span class="hljs-string">&apos;package:lib2/lib2.dart&apos;</span> hide foo;
</code></pre>
<p>&#x4E3A;&#x4E86;&#x51CF;&#x5C11; APP &#x7684;&#x542F;&#x52A8;&#x65F6;&#x95F4;&#xFF0C;&#x52A0;&#x8F7D;&#x5F88;&#x5C11;&#x4F7F;&#x7528;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x6211;&#x4EEC;&#x8FD8;&#x53EF;&#x4EE5;&#x5EF6;&#x8FDF;&#x5BFC;&#x5165;&#x5E93;&#x3002;&#x4F7F;&#x7528; <code>deferred as</code>&#x5173;&#x952E;&#x5B57;&#x5EF6;&#x8FDF;&#x5BFC;&#x5165;</p>
<pre><code class="lang-dart"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;package:deferred/hello.dart&apos;</span> deferred <span class="hljs-keyword">as</span> hello;

<span class="hljs-comment">// &#x5F53;&#x9700;&#x8981;&#x4F7F;&#x7528;&#x65F6;&#xFF0C;&#x518D;&#x901A;&#x8FC7;&#x5E93;&#x6807;&#x8BC6;&#x7B26;&#x8C03;&#x7528; loadLibrary&#x51FD;&#x6570;&#x52A0;&#x8F7D;</span>
hello.loadLibrary();
</code></pre>
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